function toggleswitch(div)
{
var option=['div01','div02','div03','div04']; // nach belieben fortsetzen ...
for(var i=0; i<option.length; i++)
{ obj=document.getElementById(option[i]);
obj.style.display=(option[i]==div) && !(obj.style.display=="block")? "block" : "none"; }
}
    function initialize() {
      if (GBrowserIsCompatible()) {
        var map = new GMap2(document.getElementById("map_canvas"));
        map.setCenter(new GLatLng(37.4419, -122.1419), 13);
      }
    }